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WARNING

Failure to follow this warning could result in personal injury, or
death.
Turn OFF power to the furnace before changing speed taps.

ELECTRICAL SHOCK HAZARD

HEAT EXCHANGER
RADIATIO “LINE OF SIGHT”

Fig . 29 - Temperature Rise Measurement

1. Operate furnace with burners firing approximately 15
minutes. Ensure all registers are open and all duct
dampers are in their final (fully or partially open) position.
2. Place thermometers in the return and supply ducts as
close to the furnace as possible. Thermometers must not
be influenced by radiant heat by being able to "see" the
heat exchanger.
3. Subtract the return air temperature from the supply air
temperature to determine the air temperature rise. Allow
adequate time for thermometer readings to stabilize.
4. Adjust temperature rise by adjusting the circulator blower
speed. Increase blower speed to reduce temperature rise.
Decrease blower speed to increase temperature rise.
Refer to the following section for speed changing details.

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Refer to Table 2 - Air Delivery - CFM (Without Filter)*

This furnace is equipped with a PSC circulator blower motor. This
blower provides ease in adjusting blower speeds. The cooling blower
speed is shipped set on HIGH. High heat ships on MEDIUM and low
heat is shipped on MEDIUM-La. These blower speeds should be
adjusted by the installer to match the installation requirements so as
to provide the correct heating temperature rise and the correct
cooling CFM

To adjust the circulator blower speed proceed as follows:
1. Turn OFF power to the furnace.
2. Select the heating and cooling blower speeds that match
the installation requirements from the Table 5 - Air Delivery
- CFM (Without Filter)*
3. Relocate desired motor leads to the circulator blower heat
and cool speed terminals on the integrated control module.
(Terminals are identified as HEAT and COOL (hot)). If
heating and cooling blower speeds are the same a jumper
wire must be used between the heat and cool terminals.

4. Connect all unused blower motor leads to the "PARK"
terminals on the integrated control module. Any leads not
connected to the "PARK" terminals must be taped.
5. Turn ON power to furnace.
6. Verify proper temperature rise as outlined in Temperature
Rise section.

ЭЧОЭЛФЯМСО ЮФСЙЫО ЪЯТ МЧУЧТЩ ЯЬЦЛНМУЫТМ

NOTE: Items in this section refer to the

air circulator blower fan

NOT to the induced draft blower. The induced draft blower timing
sequence is not adjustable. The circulator blower fan timing is
adjustable.

As shipped, the circulator blower fan will remain on for 120
seconds after the gas valve closes. When a call for cooling occurs
the circulator fan comes on and remains on for 40 seconds after
the call for cooling ends. During normal heating operation, the
circulator fan will come on approximately 30 seconds after the
gas valve opens.

Fig. 30 Adjustment Switches - (Not present on all models)

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Fig. 31 Burner Flame

The burner flames should be inspected with the burner compartment
door installed. Flames should be stable quiet soft and blue
(dust may cause orange tips but they must not be yellow). Flames
should extend directly outward from the burners without curling
floating,or lifting off, and should enter heat-exchanger tube.
Flames must not impinge on the sides of the heat exchanger firing
tubes.

Check the burner flames for
1. Good adjustment
2. Stable, soft and blue
3. Not curling, floating, or lifting off

Return Air

Supply Air

WARNING

To avoid personal injury or death. Do not remove any interal
compartment covers or attempt any adjustment. Electrical
compartments are contained in both compartments. Contact a
qualified service agent at once if an abnormal flame
appearance should develop.

FIRE, EXPLOSION, ELECTRICAL SHOCK,AND CARBON
MONOXIDE POISONING HAZARD